Abstract: In order to explore the unclassified-tailing slurry rheological property under the influence of temperature，taking an iron ore unclassified-tailing as test object，the orthogonal design was adopted to design experiment，and temperature adjustable rheometer was used to test rheological parameters.Then the influence rule of mass concentration，temperature，and the cement-sand ratio on slurry rheological parameters were analyzed.The results show that the influence degree of factors on the yield stress is mass concentration>temperature>the cement-sand ratio；There are certain interactions among various factors，and the interaction between temperature and concentration is obvious，and the yield stress rise sharply while the mass concentration is higher than 79%；To meet the requirements of the liquidity and the concentration，and reduce the effects of temperature and cement-sand ratio，slurry concentration should be controlled below 78% in the process of the filling.

Key words: Rheological property, Unclassified-tailing, Temperature, Backfilling, Slurry